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I'd say its been a slow process which is why there are no stress related cracks formed from a sudden loading. A bit of seasonal moisture as the beam/truss has deformed would see the gyprock change shape slowly without cracking. Shouldn't be too dangerous in the meantime but i wouldnt sleep or sit under it in.
You've got a carpenter coming and if he's a good roofie then you should have no worries.
Might be a case of jacking up the roof over the area and strengthening it up.
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